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Hi,
I'm trying to make rules for some type of component only route

in one specific layer (bottom or top) in a 2 side board. I'm using
the InComponent('designator') function in the advanced query and
make the constraints for just one type of layer (bottom or top)
but Protel still route that in 2 two layers.

Anybody has any idea?

Yes. You can force to route on a specific layer by having a layer
specific keepout placed around your component.

Eg when you don't want a bottom trace underneath your component,
just place a track around it on the bottom layer and set it as
keepout.